The design and use of composite steel and concrete spans for railway bridges is
addressed in Section 5.1 of Chapter 15 of the AREMA Manual for Railway
Engineering. This type of superstructure comprises a steel beam or girder and a
concrete deck slab. The connection between the two materials is designed and
constructed to transfer adequate shear force, such that the two materials behave as a
single, integral unit under load.
The theory of composite design, governing the recommendations in the AREMA
Manual for Railway Engineering, is very similar to that found in the working stress
method in AASHTO and allowable stress methods in various building codes. Some of
the important issues include